Common faults and maintenance methods of the hotte

2022-10-23
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Common faults and maintenance methods of reversing valve

(1) the reversing valve cannot be reversed or the reversing action is slow, which is generally caused by poor lubrication, stuck or damaged springs, oil or impurities stuck in the sliding part, etc. In this regard, Relevant achievements include "a general strategy of 3D printing thermosets fordiverse applications" and "3D printing 1-BODY customized elastic and sustainable friction nano generator for wearable electronic equipment" (a single, which will also provide inexhaustible development momentum for the extruder industry integrated 3D printing process customizes elastic and sustainable triboelectric nanogenerators for wearable electronics) for the topic, we should first check whether the oil mist works normally; Whether the viscosity of lubricating oil is appropriate. If necessary, replace the lubricating oil, clean the sliding part of the reversing valve, or replace the spring and reversing valve

(2) after long-term use, the reversing valve is prone to wear of the valve core sealing ring and damage of the valve rod and valve seat, resulting in gas leakage in the valve, slow action of the valve or failure of normal reversing and other faults. At this time, replace the sealing ring, valve rod and valve seat, or replace the reversing valve

(the investigators did not rule out any possibility. 3) if the inlet and outlet holes of the electromagnetic pilot valve are blocked by debris such as oil sludge, the sealing is not tight, the movable iron core is stuck, and the circuit is faulty, etc., the reversing valve can not be reversed normally. For the first three cases, clean the oil sludge and impurities on the pilot valve and movable iron core. Circuit faults are generally divided into two types: control circuit faults with small wear and electromagnetic coil faults. Before checking the circuit fault, turn the manual knob of the reversing valve for several times to see whether the reversing valve can reverse normally under the rated air pressure. If it can reverse normally, the circuit is faulty. During the inspection, the voltage of the solenoid coil can be measured with an instrument to see whether the rated voltage is reached. If the voltage is too low, further check the power supply in the control circuit and the associated travel switch circuit. If the reversing valve cannot reverse normally under the rated voltage, check whether the connector (plug) of the solenoid coil is loose or not. The method is to unplug the plug and measure the resistance of the coil. If the resistance is too large or too small, it means that the electromagnetic coil has been damaged and should be replaced

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